Articles | Updated 28 October 2026
What Is ERP? What an ERP System Includes, With a Real Shop Example
ERP is software that brings a business's core work into one system, such as sales, stock, purchasing, accounting, tax and payroll. When you record something once, the data flows to every team on its own, so the shop never retypes the same numbers in several apps and everyone, from sales staff to the accountant, sees the same figures.
What does ERP stand for?
ERP stands for Enterprise Resource Planning. Resources here means everything a business uses to make money: stock, cash, staff and time. An ERP system shows these resources in one place, so you can plan when to reorder, whether cash will cover your bills, and which branch makes a profit.
ERP used to be for large companies, because it meant buying servers and paying for months of implementation. Today there are online ERPs with a monthly fee, so shops and SMEs can use one without a big upfront investment.
What does an ERP system include?
Each ERP brand groups things differently, but Thai shops and SMEs mainly use these 7 areas.
Sales and sales documents
What it does: Point of sale, quotations, invoices and receipts
Example in a shop: Sell at the counter and issue a tax invoice to a company customer
Products and stock
What it does: Receiving, issuing, transfers between branches and stock counts
Example in a shop: Know which items are running low before a customer asks
Purchasing and payables
What it does: Purchase orders, goods receipts, payables and supplier payments
Example in a shop: Know which suppliers you must pay this month, and how much
Account
What it does: Journal entries, trial balance and profit and loss
Example in a shop: See the month's profit without waiting for the books to close
Tax
What it does: Output and input tax reports, PP.30 and withholding tax
Example in a shop: Prepare tax filings from real bills, with no manual totals
HR and payroll
What it does: Staff records, time tracking, leave, payroll and social security
Example in a shop: Run payroll for the whole shop from real working hours
Management reports
What it does: Summaries of sales, costs, profit and cash
Example in a shop: Compare which branch sells well and truly makes a profit
| Area | What it does | Example in a shop |
|---|---|---|
| Sales and sales documents | Point of sale, quotations, invoices and receipts | Sell at the counter and issue a tax invoice to a company customer |
| Products and stock | Receiving, issuing, transfers between branches and stock counts | Know which items are running low before a customer asks |
| Purchasing and payables | Purchase orders, goods receipts, payables and supplier payments | Know which suppliers you must pay this month, and how much |
| Account | Journal entries, trial balance and profit and loss | See the month's profit without waiting for the books to close |
| Tax | Output and input tax reports, PP.30 and withholding tax | Prepare tax filings from real bills, with no manual totals |
| HR and payroll | Staff records, time tracking, leave, payroll and social security | Run payroll for the whole shop from real working hours |
| Management reports | Summaries of sales, costs, profit and cash | Compare which branch sells well and truly makes a profit |
Example: what ERP does after one sale
Say a shop sells 10 packs of drinking water to a company customer and issues a full tax invoice. With ERP, staff make the sale once and the system does the rest:
- Issues the tax invoice with a continuous document number
- Takes 10 packs of water out of stock and warns you when it drops below your set level
- Posts revenue, output tax and cost of goods automatically
- Adds the bill to the month's output tax report, ready for PP.30
- Adds it to today's sales and profit, which the owner can check on a phone
How is ERP different from MRP?
MRP stands for Material Requirements Planning: planning raw materials for production, meaning what to buy, how much and when, so you can produce in time for orders. MRP is one part of the work in a factory, while ERP covers the whole business: sales, purchasing, stock, accounting, tax and people.
A shop that buys and resells does not need full MRP; setting a reorder point for each item is enough. A small factory that makes its own products should look for an ERP with bills of materials (BOM), so raw materials and production costs are handled in the same system as sales.
5 signs your shop should start using ERP
- You sell in one app, track stock in Excel, and send bills for the accountant to key in again
- At month end, sales, stock and accounts don't match and you lose time tracing why
- You have a second branch, or several staff who need to see different data
- You are VAT registered and file PP.30 and withholding tax every month
- You want each month's real profit without waiting for the accountant's statements
Installed or online ERP: which to choose
Custom-implemented ERP suits large organisations with very specific processes and their own IT team; costs are usually split into software, implementation and yearly maintenance. Online ERP suits shops and SMEs that want to start fast, pay monthly and not look after servers. Before choosing, ask to trial it with your real data, and ask clearly whether you can export your data if you leave.
Frequently asked questions
- What is ERP, in simple terms?
- ERP is one program where sales, stock, accounting, tax and payroll connect on their own. Record something once and every team sees the same numbers, with no retyping.
- How is ERP different from accounting software?
- Accounting software takes figures that were already summarised and posts them. ERP starts from the work itself, such as counter sales and goods receipts, and posts the accounts from that work automatically.
- Can a small shop use ERP?
- Yes. A monthly online ERP works from a single branch, with no servers to buy and no implementation project.
- Is there a Thai-language ERP?
- Yes. Choose one that issues Thai documents and tax reports itself, such as tax invoices, PP.30 and withholding tax certificates, so you don't need a separate program for tax.
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